Glosphil Posted November 13, 2006 Share Posted November 13, 2006 When I change gear I notice a slight clunk from behind, like a judder. Has this on a Z3 Sport and it was because of the gear needed to transfer power to the rear wheels, but it was excessive and ended up being the diff replaced. So, should I worry ? Link to comment Share on other sites More sharing options...
Jake Posted November 13, 2006 Share Posted November 13, 2006 I'd definitely get it checked out. Does it sound like it's in the drive train? Does it sound like the diff again? Do you have the stock LSD or open diff? Link to comment Share on other sites More sharing options...
supRo Posted November 13, 2006 Share Posted November 13, 2006 Is it the 6 speed box? I believe it is totally normal. Some people agree, some don't My car has now done 35K miles since I bought it and it's still the same - nothings fallen off or blown up! I've had the drive train all checked out and it's fine Link to comment Share on other sites More sharing options...
Glosphil Posted November 13, 2006 Author Share Posted November 13, 2006 I'd definitely get it checked out. Does it sound like it's in the drive train? Does it sound like the diff again? Do you have the stock LSD or open diff? Dont know tbh, im not a mechanic, just a kinda rocking feel from the gear, like something engaging. if u push the clutch in and out in gear u get a knocking. I think it may be normal, just wasnt sure. Link to comment Share on other sites More sharing options...
supRo Posted November 13, 2006 Share Posted November 13, 2006 Is it a deep thud/clunk? Almost as if someone has used a heavy rubber mallet on the underside behind the gear box?!! Some links for info: http://www.mkivsupra.net/vbb/showthread.php?t=61903&highlight=gear+thud http://www.mkivsupra.net/vbb/showthread.php?t=74457&highlight=thud http://www.mkivsupra.net/vbb/showthread.php?t=69659&highlight=clunk http://www.mkivsupra.net/vbb/showthread.php?t=20377&highlight=clunk http://www.mkivsupra.net/vbb/showthread.php?t=28248&highlight=clonk Link to comment Share on other sites More sharing options...
Mike M Posted November 13, 2006 Share Posted November 13, 2006 Mine does this too but only when putting it in 1st after sitting in Neutral at the lights. Deep sounding thump from the back. My auto NA used to do it too when selecting drive or reverse. Is yours doing it like when your on the move? every gear change? Link to comment Share on other sites More sharing options...
Glosphil Posted November 13, 2006 Author Share Posted November 13, 2006 Is it a deep thud/clunk? Almost as if someone has used a heavy rubber mallet on the underside behind the gear box?!! Some links for info: http://www.mkivsupra.net/vbb/showthread.php?t=61903&highlight=gear+thud http://www.mkivsupra.net/vbb/showthread.php?t=74457&highlight=thud http://www.mkivsupra.net/vbb/showthread.php?t=69659&highlight=clunk http://www.mkivsupra.net/vbb/showthread.php?t=20377&highlight=clunk http://www.mkivsupra.net/vbb/showthread.php?t=28248&highlight=clonk Cheers bud, sounds as if its normal from reading those. Link to comment Share on other sites More sharing options...
Nic Posted November 13, 2006 Share Posted November 13, 2006 Is the noise from the gearbox or rear diff? The stock 6spd gearbox is a bit 'agricultural' and can be a bit clunky, if the noise is from the diff then it could be wear. I'd start by getting the gearbox and diff oil changed and see if that helps. See guide here for recommended fluids: http://mkivsupra.net/vbb/showthread.php?t=56684 Link to comment Share on other sites More sharing options...
Nic Posted November 13, 2006 Share Posted November 13, 2006 If you're not sure if you have an LSD or open diff check the Trans/Axle number on the VIN plate in the engine bay. If the number ends with A it is an open diff, if it ends in B it is an LSD. Link to comment Share on other sites More sharing options...
Glosphil Posted November 13, 2006 Author Share Posted November 13, 2006 If you're not sure if you have an LSD or open diff check the Trans/Axle number on the VIN plate in the engine bay. If the number ends with A it is an open diff, if it ends in B it is an LSD. It ends in a B, just had a look. Is that good ? or bad ? Link to comment Share on other sites More sharing options...
Nic Posted November 13, 2006 Share Posted November 13, 2006 It ends in a B, just had a look. Is that good ? or bad ? That's good the Limited Slip Differential provides better power delivery and grip to the rear wheels. Link to comment Share on other sites More sharing options...
supRo Posted November 14, 2006 Share Posted November 14, 2006 Mate, If you are still worried then book it in with Phoenix in Watford. Ask them to do Gearbox oil and Diff oil change and tell them you are worried about the noise. Mark will check it out for you. Tell him I sent you there. Worth the trip! Cheers, Ro Link to comment Share on other sites More sharing options...
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